I got this kit from Australia on ebay. They are hard to find. It was brand new, all the parts still in the bags. The first thing I’m doing is removing the molded on plastic railings so I can replace them with brass. Some are easy to clip off, others are impossible to get to. For the tightly placed ones I’m using a Foredom Tool to make enough room for me to get small files in there to fine tune the openings. The tool works great for stuff like this as it can operate from 0 RPM and reverse which helps to stop any climbing.